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已对低碳钢试样进行了近海涂装和暴露试验。设计的试样给出了一种具有近海平台典型设计特征的真实横截面。这些包括平板、管子、轧制的工字钢梁以及包括粗糙的焊缝、尖锐的边缘、毛口、钻孔和螺钉头。这些典型的部位可能会产生早期的结构上的腐蚀。选择了十二种普通涂料体系。1974年开始试验时,它们是正用于保护固定式钻井平台水线上部结构的典型涂料体系。在英国北海Viking油田的大陆石油有限公司的一座天然气钻井平台上进行样板表面准备和油漆涂装工作,在专职检查下,表面准备和油漆施工都是采用一般的施工方法和程序。在施工过程中仔细地监测大气和钢件的温度、相对湿度、喷砂的细则和漆膜厚度。故意使已经喷砂清洗后的试样的一面在涂底漆之前“起霜”,以得到一种底漆对表面条件允许程度的附加资料。准备了数套同样大小的样扳,一套只处于暴露状态,第二套使其保持在控制的条件下作为对照。对已做暴露试验的试样在6、14、17、29和39个月后仔细地进行直观肉眼检查,详细地记录涂料体系破环的情况。除此之外,从已暴露的样板上割下样片在实验室内用显微镜和扫描电镜方法进行研究。本文给出直观检查结果和一些实验室研究情况,并对观察到的涂料性能变化作了讨论。
Offshore coatings and exposure tests have been performed on mild steel specimens. The designed specimen gives a true cross-section with typical design features of an offshore platform. These include slabs, pipes, rolled I-beams, and include rough welds, sharp edges, burrs, holes and screw heads. These typical sites can cause early structural corrosion. Choose 12 kinds of ordinary coating system. When the trial began in 1974, they were the typical paint systems that were being used to protect the superstructure of water lines in stationary drilling platforms. Surface preparation and paint painting are performed on a natural gas drilling rig of Continental Oil Co., Ltd., Viking Oilfield, North Sea, UK. Surface preparation and paint application are performed using general construction methods and procedures under full-time inspection. Carefully monitor the atmosphere and steel temperature, relative humidity, sandblasting rules, and film thickness during construction. The side of the sample that has been sandblasted is deliberately “bloomed” prior to priming to provide additional information on the extent to which the primer is permissible for surface conditions. Prepared several sets of the same size of the sample pull, one only in the exposed state, the second set to keep it under control as a control. Specimens exposed for testing were carefully inspected visually for 6, 14, 17, 29 and 39 months to document in detail the failure of the coating system. In addition, samples were cut from exposed panels and examined in the laboratory using microscopy and scanning electron microscopy. This paper presents visual inspection results and some laboratory studies, and discusses the observed changes in coating performance.